Several coals were pre-oxidized by air at 250,270 and 300°C to different levels, then the carbonization behaviors of the pre-oxidized coals were systematically examined. The gas formation rate and weight change during the carbonization were measured continuously using a mass spectrometer and a thermogravimetric analyzer, respectively. The changes in the functional groups during the carbonization were measured by an in-situ MIR technique. The micropore distributions of the pre-oxidized coals were measured before and after the carbonization. From these measurements the effect of pre-oxidation on the carbonization mechanism of coal was discussed.
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